全应力—应变下裂隙灰岩水—力耦合特性研究
发布时间：2019-04-24 11:00
【摘要】：全应力-应变下岩体的力学特性和应力场下岩体的渗透规律研究是岩石力学学科领域研究的前沿方向。岩石内部大都存在多种非连续面,其中包含孔隙,节理,微裂纹等各种缺陷,这些缺陷为裂隙流体的储存和流动提供了空间场所。我国南方煤田大多是以充水溶洞为主的茅口灰岩岩溶矿床,研究含裂隙茅口灰岩的强度特性、渗流力学特性和渗流场下的破坏特性为研究南方煤矿突水防治、隧道开挖等提供一定的理论依据。本文通过取从小到大具有代表性的渗透压与围压并分配组合,对含裂隙灰岩进行了水-力耦合试验,由试验结果对裂隙灰岩在全应力-应变过程中的力学特征变化以及渗透性特征进行了分析研究并且探讨了水-力耦合作用下裂隙灰岩的强度变化和以及变形特征。为了便于研究,文中还取了全应力-应变过程中六个相对重要的点的渗透率值做了定义。本文研究的主要结果如下:1、渗透压对裂隙灰岩的力学特征有一定的影响,裂隙灰岩的强度以及变形模量会因为渗透压的存在而有一定程度的下降,渗透压的存在对岩体的侧向变形会有加强作用,水-力耦合作用下裂隙灰岩的强度特征变化过程相对的影响因素更多,可以运用莫尔-库仑屈服准则来表示;2、裂隙灰岩的渗透率在试验过程中的变化会经过渗透率缓慢下降、渗透率缓慢增加、渗透率快速增长和渗透率小幅度下降一共四个阶段。对比全应力-应变曲线,这四个阶段较好的对应于其中的岩石体积压缩阶段、近线性变形阶段、峰值点左右破裂阶段和峰后残余强度阶段。这种对应关系的一致性更好的表现在渗透率较低的情况下,在渗透率较高时,会存在一定的不一致性,其中渗透率下降过程要少于体积压缩的过程;3、对于体积压缩阶段的渗透率与其体积应变之间的关系,由于其吻合性不同,在较低渗透压的情况下,可以用负指数函数来进行拟合,而在较高渗透压的作用下,可以用三次多项式来进行拟合。
[Abstract]:The research on the mechanical properties of rock mass under total stress-strain and the seepage law of rock mass under stress field is the frontier direction in the field of rock mechanics. There are many kinds of discontinuous surfaces in rock interior, which contain many kinds of defects such as pores, joints, micro-cracks and so on. These defects provide a space for the storage and flow of fractured fluids. Most of the coal fields in southern China are maokou limestone karst deposits dominated by water-filled karst caves. The strength characteristics of fissure-bearing Maokou limestone, the characteristics of seepage mechanics and the failure characteristics under seepage field are studied for the prevention and treatment of water inrush in southern coal mines. Tunnel excavation provides a certain theoretical basis. In this paper, the hydraulic-mechanical coupling test of fractured limestone is carried out by taking the typical combination of osmotic pressure and confining pressure from small to large. The mechanical and permeability characteristics of fracture limestone in total stress-strain process are analyzed and studied based on the experimental results. The strength change and deformation characteristics of fracture limestone under water-force coupling are also discussed. In order to facilitate the study, the permeability values of six relatively important points in the total stress-strain process are also defined. The main results obtained in this paper are as follows: 1. Osmotic pressure has a certain effect on the mechanical characteristics of fractured limestone, and the strength and deformation modulus of fractured limestone will decrease to a certain extent due to the existence of osmotic pressure. The existence of osmotic pressure will strengthen the lateral deformation of rock mass. There are more influencing factors in the process of strength change of fractured limestone under water-force coupling, which can be expressed by Mohr-Coulomb yield criterion (Mohr-Coulomb yield criterion). 2. During the test, the permeability of fractured limestone will decrease slowly, the permeability will increase rapidly, and the permeability will decrease by a small extent, there are four stages: the permeability decreases slowly, the permeability increases slowly, and the permeability increases slowly. Compared with the total stress-strain curves, these four stages correspond well to the rock volume compression stage, the near linear deformation stage, the rupture stage around the peak point and the residual strength stage after the peak. The consistency of the corresponding relation is better in the case of low permeability, when the permeability is high, there will be some inconsistency, in which the process of permeability decrease is less than the process of volume compression. 3, for the relationship between permeability and volume strain in the stage of volume compression, because of its different coincidence, the negative exponential function can be used to fit under the condition of lower osmotic pressure, but under the action of higher osmotic pressure, the relationship between the permeability and the volume strain can be fitted by negative exponential function under the condition of lower osmotic pressure. Cubic polynomial can be used to fit.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD313
本文编号：2464394
[Abstract]:The research on the mechanical properties of rock mass under total stress-strain and the seepage law of rock mass under stress field is the frontier direction in the field of rock mechanics. There are many kinds of discontinuous surfaces in rock interior, which contain many kinds of defects such as pores, joints, micro-cracks and so on. These defects provide a space for the storage and flow of fractured fluids. Most of the coal fields in southern China are maokou limestone karst deposits dominated by water-filled karst caves. The strength characteristics of fissure-bearing Maokou limestone, the characteristics of seepage mechanics and the failure characteristics under seepage field are studied for the prevention and treatment of water inrush in southern coal mines. Tunnel excavation provides a certain theoretical basis. In this paper, the hydraulic-mechanical coupling test of fractured limestone is carried out by taking the typical combination of osmotic pressure and confining pressure from small to large. The mechanical and permeability characteristics of fracture limestone in total stress-strain process are analyzed and studied based on the experimental results. The strength change and deformation characteristics of fracture limestone under water-force coupling are also discussed. In order to facilitate the study, the permeability values of six relatively important points in the total stress-strain process are also defined. The main results obtained in this paper are as follows: 1. Osmotic pressure has a certain effect on the mechanical characteristics of fractured limestone, and the strength and deformation modulus of fractured limestone will decrease to a certain extent due to the existence of osmotic pressure. The existence of osmotic pressure will strengthen the lateral deformation of rock mass. There are more influencing factors in the process of strength change of fractured limestone under water-force coupling, which can be expressed by Mohr-Coulomb yield criterion (Mohr-Coulomb yield criterion). 2. During the test, the permeability of fractured limestone will decrease slowly, the permeability will increase rapidly, and the permeability will decrease by a small extent, there are four stages: the permeability decreases slowly, the permeability increases slowly, and the permeability increases slowly. Compared with the total stress-strain curves, these four stages correspond well to the rock volume compression stage, the near linear deformation stage, the rupture stage around the peak point and the residual strength stage after the peak. The consistency of the corresponding relation is better in the case of low permeability, when the permeability is high, there will be some inconsistency, in which the process of permeability decrease is less than the process of volume compression. 3, for the relationship between permeability and volume strain in the stage of volume compression, because of its different coincidence, the negative exponential function can be used to fit under the condition of lower osmotic pressure, but under the action of higher osmotic pressure, the relationship between the permeability and the volume strain can be fitted by negative exponential function under the condition of lower osmotic pressure. Cubic polynomial can be used to fit.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD313
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